The date-picker should allow these inputs: 1. only year, 2. year + month, 3. year + month + day.
Also, people should not be forced to use the time picker. E.g., selecting the year can be really time-consuming since people may start from ancient years.
It may be better to let the users add manually the dates, maybe forcing the format like the following image: https://i.stack.imgur.com/pqYRC.png
The date-picker should allow these inputs: 1. only year, 2. year + month, 3. year + month + day.
Also, people should not be forced to use the time picker. E.g., selecting the year can be really time-consuming since people may start from ancient years.
It may be better to let the users add manually the dates, maybe forcing the format like the following image: https://i.stack.imgur.com/pqYRC.png